Not sure about this at all
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well either common or highland darter, can't remember if they are currently considered two different species or only one.
I was thinking the same either Common or Highland, the reference books say the common darter is scarcer in Scotland, so thought it is more likely a Highland Darter.
The British Dragonfly Society list the common as Sympetrum striolatum and the Highland as Sympetrum nigrescens so I assumed they are separate species?
Wildlife of Assynt
There seems to be some disagreement about the status of these two forms, most of the sources I have access to say that the Highland 'probably' isn't a separate species, but they've kept it on the list just in case! There's a bit more info on the Northern Irish "Habitas" site:
Entomologist and biological recorder
Lat/Lng: 58.1, -5.3
OS grid ref: NC0720